soc/amd/stoneyridge: Increase preram console size

Increase the default setting to add more CAR space for the early
console.  This avoids truncation of the log.

BUG=b:64980233

Change-Id: Ia11d1c6c186a7025510c240206743ebe8d741461
Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-on: https://review.coreboot.org/21186
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/amd/stoneyridge/Kconfig

@@ -80,6 +80,12 @@ config DCACHE_BSP_STACK_SIZE
 	  The amount of anticipated stack usage in CAR by bootblock and
 	  other stages.
 
+config PRERAM_CBMEM_CONSOLE_SIZE
+	hex
+	default 0x1200
+	help
+	  Increase this value if preram cbmem console is getting truncated
+
 config CPU_ADDR_BITS
 	int
 	default 48